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Rex is a possum first mentioned in Legendaddy. Marshall presents him to his friends, to see how far he could go, without anyone saying anything, after he found out, that his friends treat him "with kid gloves" since his father died .

Rex is a male opossum colloquially called possum, which Marshall claims to have found in the trash and decided, that he lives with him and Lily from that day on. In reality he just wanted to test his friends how far they would let him go, after his father died, without being honest to him. Lily responds that she'd love Rex, which makes Marshall mad at her and his friends.